Periventricular leukomalacia causes visual impairment in preterm infants. A study on the aetiologies of visual impairment in a population-based group of preterm children born 1989 - 1995 in the county of Varmland, Sweden. - Jacobson,L.; Lundin,S.; Flodmark,O.; Ellstrom,K.G. (Acta Ophthalmol Scand, 1998)